alk
> wrote:
>
> Hello Michael,
>
>> We have an 8650 at the Rhode Island Computer Museum. Unfortunately I don't
>> think that there is any home of getting it running again.
>> https://www.ricomputermuseum.org/collections-gallery/equipment/dec-vax-8650
>>
&g
Early Honeywell boards were wire-wrap so they could easily be updated in
the field. The board tester we had read test vectors from punched cards and
stopped reading cards when it found a fault. The tester had a display for
the card number. The FE looked up the test and card number and the chart
sai
s (more or less
> accurately). But there are also the wiring diagrams, which are the actual
> fully completed schematics. If you want to understand the machine, the
> block diagrams are excellent; if you want to replicate it, they are not
> sufficient and the wiring diagrams are actually what you need.
>
> paul
>
>
--
Michael Thompson
Do you have any TU55 ot TU56 DECtape heads?
On Thu, Jun 26, 2025, 10:24 PM Paul Anderson via cctalk <
cctalk@classiccmp.org> wrote:
> Hi Peter,
>
> The BA11-M is the 4 x 4 box for the 11/03, and I would not recommend it for
> an 11/23 or 23+. The BA11-SA would be my pick.
>
> I can ship them. Whe
Can you get the manual scanned and put on Bitsavers?
> On Jun 10, 2025, at 4:24 PM, hupfadekroua via cctalk
> wrote:
>
> Meanwhile I got a Sparcbook 1 technical reference manual.
>
> Even the 1 version does have a battery backed sram e.g. responsible for the
> RTC using a MK48T02.
>
> Mayb
>
>
> Also, don’t try to print without the rubber print hammer, the typeface
> metal is softer than the metal of the print hammer, and without the rubber
> hammer in place you will quickly flatten out the letters. A small piece of
> vinyl tubing can work as a temporary substitute.
>
> Frank
>
The
evolution, OS-side, or
> was this a re-hash of what already was available?
>
> It's a historical event as per se but much more than that I'm not sure!
>
> Happy computing!
>
> Murray 🙂
>
--
Michael Thompson
um 10:28 Uhr schrieb J. Peterson via cctalk <
> cctalk@classiccmp.org>:
>
> > This link has an update from 2023, along with an email address.
> >
> > https://www.pdp-11.nl/fieldguide.html
> >
> > On 2/13/2025 12:24 AM, Hans-Ulrich Hölscher via cctalk wrote:
> > > Megan Gentry
> >
>
--
Michael Thompson
Would a motor generator be less expensive?
> On Oct 12, 2024, at 7:51 AM, hupfadekroua via cctalk
> wrote:
>
> Hi all,
>
> after approx 30 years of waiting our time has come to get hands on a Cyber
> 180/860a.
>
> These systems as other systems before are using 400Hz psus.
>
> One approach
Or a PDP-10 KS10.
On Sat, Jul 27, 2024 at 2:23 PM Paul Koning via cctalk <
cctalk@classiccmp.org> wrote:
> That's right. If you have an RM03, you'll need either an RH70, or a VAX.
>
> paul
>
>
>
--
Michael Thompson
The CDC test system for the RM03 is a standard SMD device. You disconnect the
Massbus interface and connect the test system where the Massbus interface was
connected. So the drive interface is probably standard SMD. The data transfer
of the 9762 is fairly high, so it may not work with slow contr
Decitek is still in business, so try decitek.com
> On May 16, 2024, at 10:13 AM, Michael Fritsch via cctalk
> wrote:
>
> I have a Decitek 442A9 papertape reader which needs repair.
>
> I have already replaced the belt, but that is not enough. The reader behaves
> very strangely. It starts run
readable
> source code. That turned up on one of my tapes, so I forwarded it on.
>
> You can see the whole shebang at
> http://pascal.hansotten.com/niklaus-wirth/cdc-6000-pascal-compilers/
>
> I've written code in Pascal, as well as Modula-2. Never liked
> it--seemed to be a bit awkward for the low-level stuff that I was doing.
>
> --Chuck
>
>
--
Michael Thompson
Most modern Diesel engines use a common-rail electronically controlled
injection system.
> On May 8, 2024, at 8:58 AM, Paul Koning via cctalk
> wrote:
>
>
>
>> On May 8, 2024, at 7:56 AM, CAREY SCHUG via cctalk
>> wrote:
>>
>> At a local linux meeting, the leader was disparaging any resur
used a
> custom magnetic tape cartridge for storage and a Selectric typewriter for
> I/O.
>
> paul
>
>
The Rhode Island Computer Museum has two IBM Mag Card Selectric systems,
and just got an IBM Cassette Selectric System.
--
Michael Thompson
Clean the connectors and reseat the socketed chips and it will probably work.
> On Apr 11, 2024, at 1:55 PM, Bill Gunshannon via cctalk
> wrote:
>
>
>
> One last shot.
>
> I have an RX Floppy disk unit. Worked fine until one
> time the last time I had it hooked up and after about
> an hour
plugged into
> it. What is it?
> https://w2hx.com/?prefix=x/What-Is-It/PDP-11-Thing/Board1/
>
> The second one has this 50 pin IDC connector on it. Anyone recognize it?
> https://w2hx.com/?prefix=x/What-Is-It/PDP-11-Thing/Board2/
>
> Any info appreciated!
>
> 73 Eugene W2HX
> My Youtube Channel: https://www.youtube.com/@w2hx/videos
>
>
--
Michael Thompson
/A modules (AA-01?) with an RC-11 disk serving as the
> refresh memory, DMA direct to the D/A data register.
>
> paul
>
>
>
--
Michael Thompson
A photographer wandered around my workplace looking at all of the men's
hands. They were doing a closeup shot and needed just hands. More than a
little strange.
On Mon, Mar 18, 2024, 6:15 AM Norman Jaffe via cctalk
wrote:
> I had the same experience while working for a (very) small company calle
Some of the pictures were staged in a parking lot. They probably didn’t have a
room big enough.
> On Mar 17, 2024, at 10:55 AM, Paul Koning via cctalk
> wrote:
>
>
>
>> On Mar 17, 2024, at 10:13 AM, Bill Gunshannon via cctalk
>> wrote:
>>
>>
>> I have often wondered about the people we f
Air-Cooled) to test the tail end of
> hardware that we are still shipping (by now EOL and basically NOS).
> >
> > But it's work, I don't find them interesting.
> >
> > If someone here has the warm fuzzies for PPC VME, we can talk :-)
> >
> > W
> >
>
>
--
Michael Thompson
even run multiple OS-es simultaneously.
> > >
> > > -tih
> > > --
> > > Most people who graduate with CS degrees don't understand the
> > significance
> > > of Lisp. Lisp is the most important idea in computer science. --Alan
> > Kay
> > >
> >
>
--
Michael Thompson
The RICM got a complete 11/20 donation a few weeks ago, so we no longer
need parts to complete the empty chassis.
On Sun, Jan 28, 2024, 11:37 PM Paul Anderson via cctalk <
cctalk@classiccmp.org> wrote:
> A quick update: The seller and I have not been able to reach a deal on any
> of this. He is l
You could contact https://www.wmbt.org/ to see if they have a Bosch or Sony DEC
to read the tapes.
> On Dec 31, 2023, at 8:58 PM, Zane Healy via cctalk
> wrote:
>
>> On Dec 31, 2023, at 1:42 PM, The Doctor via cctalk
>> wrote:
>>
>> On Saturday, December 30th, 2023 at 23:24, Chuck Guzis via
I think a complete system would be worth more than the sum of its parts.
On Mon, Oct 30, 2023, 3:27 AM Paul Anderson via cctalk <
cctalk@classiccmp.org> wrote:
> Hi Michael,
>
> I might be able to part out a system. Any idea what one is worth?
>
> Paul
>
> On Fri, Oct
The RICM has an empty 11/20 chassis and the power supply. All it needs is
the processor backplanes. Is there any chance you have a set of backplanes
available?
On Fri, Oct 20, 2023, 2:35 AM devin davison via cctalk <
cctalk@classiccmp.org> wrote:
> I have a few systems in rough shape, and need pa
I have seen lots of small differences between machines with no real explanation
of why.
> On Sep 12, 2023, at 10:11 AM, Bill Degnan via cctalk
> wrote:
>
> The recent Ebay auction for the original PDP-8 got my attention because one
> of the photos (the processor logic flipchip array) is a nice
f reach of people who just want the pleasure of using them rather than
> > looking for the next bagholder. The main difference is that I can just
> buy
> > the parts to build my own Apple 1 and nobody's going to stop me, whereas
> if
> > I try that with a house the local authority gets quite upset.
> >
> >
>
--
Michael Thompson
badge printers.
--
Michael Thompson
that. Who were the big tape head manufacturers at that
> time? Does anyone know?
>
We have one from Applied Magnetics Corporation, maybe the one in Goleta, CA.
--
Michael Thompson
:
> I’ve often wondered if the tape heads from consumer tape devices such as
> cassette or 4-8 track tape players could be used or be made to be used as
> replacements. Anybody ever try that?
>
> Sent from my iPhone
>
> > On Feb 7, 2022, at 11:51, Michael Tho
ove the potting material, but thought
that it would eat the enamel off the head coil wires and damage them beyond
repair.
So far we haven't found a way to repair the heads.
Michael Thompson
7;t any bigger than a 780...
>
> C
>
There is an 8650 at the RICM.
https://www.ricomputermuseum.org/collections-gallery/equipment/dec-vax-8650
--
Michael Thompson
me. Figure 2-2 in the
maintenance manual shows how the MARK and DATA tracks are wired, and the
extra connection available for the TIMING track. We found a head on the
PDP-9 where the +D0 connection was open.
--
Michael Thompson
to the TU55 backplane, and possibly the K2 relay on
the G851.
In the TC01 you could swap the G888 module in slot C22, the S205 module in
slot D05, the S205 module in slot E06, the S603 module in slot C02, or the
R123 module in slot E08, with another one to see if the glitch moves to
another bit.
--
Michael Thompson
e chassis.
My Sun 2/50 desktop client has a DA-15 keyboard connector on the back and
has the mouse plugged into the keyboard.
I have a black Mouse Systems mouse with a Sun sticker on the front. P/N
900783-002/01. Maybe for a Sun-1?
--
Michael Thompson
I believe that the CDC built RP04 has a three-phase spindle motor.
> On Jul 15, 2021, at 5:13 PM, Paul Koning wrote:
>
>
>
>> On Jul 15, 2021, at 4:33 PM, Michael Thompson
>> wrote:
>>
>> The power cord is three-phase, and actually daisy-chains to a se
you will see only two of the phases going to the power transformer.
On Thu, Jul 15, 2021 at 4:22 PM Paul Koning wrote:
>
>
> > On Jul 15, 2021, at 4:19 PM, Michael Thompson via cctech <
> cct...@classiccmp.org> wrote:
> >
> >>
> >> From: Paul Koning
le-phase to use with PDP-10
KS10 at home. Instructions are here:
https://sites.google.com/site/mthompsonorg/Home/pdp-10/rm03-and-rp06-information/rp06
--
Michael Thompson
equired on I/O cables longer than 20 ft., and may be
desirable on shorter cables. For negative bus, use 220 Ohm shunt resistors
to ground on IOP 1, IOP 2, IOP 4, BTS 1, BTS 3 and Initialize. No special
termination module exists for the negative bus.
--
Michael Thompson
enerators. We used one
at a time, and swapped the operational one each month. They cleaned up the
noise in the incoming 208VAC 3-phase power, and the really heavy flywheel
provided a little ride through for short term power drop outs.
--
Michael Thompson
and get it to blink the lights the right way.
https://www.ricomputermuseum.org/Home/interesting_computer_items/ibm-control-panels
--
Michael Thompson
I sent Josh pictures of the complete RF08/RS08 that John Wilson donated to
the RICM. I will send detailed pictures of the RS08<->RF08 cables next week.
--
Michael Thompson
e
between fire pull boxes and the 911 dispatch system in Brooklyn, NY. Both
have DV11 & DH11 serial controllers. These are capable of the very low baud
rates needed to talk to the fire pull boxes.
https://www.ricomputermuseum.org/collections-gallery/equipment/dec-pdp-11-45
--
Michael Thompson
d it reverses direction and keeps going. I
have seen some library files take three passes of the DECtape to fully
search.
--
Michael Thompson
use the same DTR01 subsystem to connect two PDP-10s together with Massbus,
or connect a PDP-10 to a PDP-11 with Massbus.
--
Michael Thompson
y the go-fast
B versions and anything else for the PDP-9. You can even get a charitable
tax deduction for the donation.
--
Michael Thompson
I have also seen the SCSI terminator power fuse blow when the terminator is
hot plugged.
On Mon, Aug 17, 2020 at 7:26 PM Chris Hanson
wrote:
> On Aug 17, 2020, at 10:52 AM, Michael Thompson via cctalk <
> cctalk@classiccmp.org> wrote:
> >
> > I have a Sun 3/E, includi
_5018027/
> <
> https://www.reddit.com/r/BSD/comments/i8c8u7/how_do_i_emulate_a_sun_3e_computer_with_5018027/
> >>
>
> Brendan
>
I have a Sun 3/E, including a SCSI/Ethernet board, that ran fine the last
time it was powered on. There is a collector in southern Germany who also
has a 3/E board set. I didn't see any contact information for the simulator
owners.
--
Michael Thompson
There is a B800 at the RICM, but nothing larger.
> On Aug 5, 2020, at 1:00 PM, cctech-requ...@classiccmp.org wrote:
>
> Burroughs L-series paper tapes
HIPPI
> interfaces, no ATM.
>
> Am also interested in finding other copies of J90 Unicos.
>
> - Ethan
>
The RICM has 8.0.2.2A and 8.0.3.3 on DAT.
--
Michael Thompson
I
Lab, LMI Founder), Ron Hochsprung(Apple), Richard Kalish, Rikki Kirzner(
Dataquest), Gerry Laws(TI), Rae Mclellan(Bell Labs), Gregory
Papadopoulos(MIT), Dan Schneider, Dave Stewart, Michael Thompson(me), Jim
Truchard(Founder National Instruments), Eike Waltz, *Steve Ward*(MIT), and
Fritz Whittington.
able to cut the keying peg off two IDE
disk cables to try as replacement cables. They IDE cables don't fit well,
but do work. I will make new replacement cables for all three panels.
--
Michael Thompson
; best regards,
> Joerg
>
That is very cool!
The RICM has a DIGI-COMP, but we have not done much with it other than put
it on display.
--
Michael Thompson
s. OK, not computer but the
> ancestor, for completeness of the history. There may be several formats of
> these.
>
>
Something like this?
http://www.ricomputermuseum.org/Home/interesting_computer_items/jacquard-loom-cards
--
Michael Thompson
regards,
> Plamen
>
I have several BriteLites, including IPC, IPX, and LX versions.
I will see what power supplies go with them.
The Sbus video board is something special for the LCD panel.
--
Michael Thompson
and you end up with two sheets of plastic and
> loose wires.
>
For low speed signals. I just replaced the flexprint with modern ribbon
cable. Seems to work just fine.
--
Michael Thompson
the bus at 3600 RPM just like the RM03, and they did manage to get the
> R80 to talk to the 11/730 with a dedicated memory channel connection
> (though maybe the R80 was heavily interleaved)
>
> C
>
ITS could boot from an RM80 on a 2020.
--
Michael Thompson
erence and Music on
Hold plug-in modules.
--
Michael Thompson
waiting on that... hint hint hint
>
There are two vintage computer groups in Rhode Island, The Rhode Island
Computer Museum <http://www.ricomputermuseum.org/>, and the Retro-Computing
Society of Rhode Island <https://www.rcsri.org/>. In this case, Curt is
talking about the Retro-Computing Society of Rhode Island.
--
Michael Thompson
nics to to connect it to the DEC tape drive bus.
--
Michael Thompson
The same is true with the TU20.
> On Aug 7, 2019, at 10:06 PM, Paul Anderson wrote:
>
> I think you could change heads in a TU10 and add or take out a few boards.
> I've worked on 7 and 9 track versions in the day.
>
>> On Wed, Aug 7, 2019 at 6:43 PM Michael Thom
connected to both 7-track and 9-track drives. The TU20 drive on the
PDP-9 at the RICM is a 7-track drive. The only difference between the
7-track and 9-track versions of the TU20 is the tape head. All of the tape
drive electronics is the same for both versions.
--
Michael Thompson
and the TC59 for the PDP-9
can be connected to both 7-track and 9-track drives. The TU20 drive on the
PDP-9 at the RICM is a 7-track drive. The only difference between the
7-track and 9-track versions of the TU20 is the tape head. All of the tape
drive electronics is the same for both versions.
--
Michael Thompson
tems. They haven't been powered on for
decades.
You are welcome to explore what we have.
http://www.ricomputermuseum.org/Home/equipment/ibm-series1
--
Michael Thompson
t does this
> (along with flipping up the backplane switch.
>
> Can someone refresh me on the proceedure?
>
> Thanks,
>
> Marc Howard
MAINDEC-08-EUFB should work on both TC01 and TC08 controllers.
--
Michael Thompson
rsions of the RDI Britelite.
--
Michael Thompson
member correctly) the Lexan softened and conformed to the inside of
the glass. We trimmed the Lexan to size, reassembled the Lexan and glass to
the front of the CRT, and glued the steel mounting band in place. It looks
great, and is probably a lot safer than just leaving the PVA out.
--
Michael Thompson
ications Guy
> i...@cvmakerspace.ca
> 250 270 0689
>
Try the toggle-in tests that are here:
https://www.pdp8online.com/pdp8cgi/query_docs/tifftopdf.pl/pdp8docs/toggle_in_programs.pdf
--
Michael Thompson
bus single-board
> > computers with 240 MFLOPS peak combined capacity.
> > --
> > Remember when 240 MFLOPS was a lot?
>
That's the board that I have.
Quad i860 on a 9Ux400 VME board.
Its in a Sun 4/280 development system.
--
Michael Thompson
ricomputermuseum.org/Home/interesting_computer_items/ibm-control-panels
You missed these MTI cluster storage servers
http://www.ricomputermuseum.org/Home/equipment/mti-storage-servers
--
Michael Thompson
nd the DG S/130 to the right of it?
http://www.ricomputermuseum.org/Home/equipment/data-general-eclipse-s-130
Michael Thompson
>
> From: Ken Seefried
> Subject: i860: Re: modern stuff
> >the i860 found at least a little niche on graphics boards, so somehow
> >not a complete failure ;-)
>
>
I have a Quad-i860 VME board in one of my Sun systems.
Michael Thompson
2158&hash=item3b0ae91713:g:NvcAAOSwqMRa4hGS:sc:USPSFirstClass!95051!US!-1
>
> Bob
>
I bought 5x of them. They are the locking style that we don't want, but I
think that we can bend the angled part to make them momentary.
Thanks for the help!
--
Michael Thompson
in and buy some modern C&K toggle switches, does anyone have a source for
Mossman or SwitchCraft switches at a reasonable price?
--
Michael Thompson
lopers here:
https://sites.google.com/site/mthompsonorg/Home/sun-microsystems/sun-386i-developers
--
Michael Thompson
It could be the Intel 8086 version. I need to look at the serial/model number
tags.
Sent from my iPhone
> On May 23, 2018, at 1:46 AM, Lars Brinkhoff wrote:
>
> Michael Thompson wrote:
>> I put a picture of the one at RICM here:
>> http://www.ricomputermuseum.org/Home/e
>
> Date: Mon, 21 May 2018 21:01:59 -0400
> From: Michael Thompson
> Subject: Re: I ran across this strange modernistic? Data General
> ...odd? computer?
> The RICM has one, but it is not on the WWW site.
>
> Michael Thompson
>
>
I put a picture
.odd? computer?
> I do not remember buying it!? ?Ed#
> ?
> ?
> "https://www.smythretail.com/wp-content/uploads/2012/05/DG10_1-300x227.jpg
> "
>
>
The RICM has one, but it is not on the WWW site.
Michael Thompson
not quite functioning owners
> club. :-) Would gladly get rid of some Ultras if I could upgrade to a
> portable.
>
The Tadpole with the 50MHz PowerPC processor was sold as an IBM N40.
I have one of those too.
--
Michael Thompson
ere.
> >
> > Zane
>
I have about 15 SPARC based lugables and laptops. Some are TRIgem/RDI
Britelites that have an IPC/IPX/LX motherboard inside, three Voyagers, the
rest are Tadpole SB2, SB3, SB3GX, and Ultrabooks.
Michael Thompson
ote:
>
> Michael Thompson wrote:
>> Please visit us at the Rhode Island Computer Museum. About 60 miles south
>> of boaton.
>> http://www.ricomputermuseum.org/
>
> If I do, I'd expect ITS to be up and running before I left.
>
> Do you have anything for KS10 networking? IMP, Chaos, Ethernet?
at the Rhode Island Computer Museum. About 60 miles south
of boaton.
http://www.ricomputermuseum.org/
We will be working in the Learning Lab on Saturdays, and can take you to
the warehouse for a tour of the static storage.
There are classic car museums not far away in Newport and Middletown, and
lots of sail boats in Newport.
--
Michael Thompson
n their PDP-12 so they
can run some benchmarking software.
We haven't been able to get DECUS 8-213 ALGOL working. Any help would be
appreciated.
--
Michael Thompson
. It is sometimes a painful process to find the right person at the
airport to stamp the Carnet on the way in and out, and often the customs
people have no idea what a Carnet is. The Carnet also costs more than $200
and requires a security deposit based on the value of the item.
https://www.export.gov/article?id=ATA-Carnet
http://www.uscib.org/ata-carnet-faqs-ud-1675/
--
Michael Thompson
I see that Joe Rigdon's old WWW pages are still on
http://www.classiccmp.org/hp/joespage.htm, but the email address doesn't
work.
The RICM is interested in the ECRM Omnibus boards that he had.
Anyone have current contact information?
--
Michael Thompson
r WWW page in a day or so.
Thanks again for everyone's help with this project.
> On Mon, Jul 31, 2017 at 8:15 PM, Michael Thompson <
> michael.99.thomp...@gmail.com> wrote:
> >
> > The RICM has an opportunity to get a PDP-8/M (built in Maynard, MA) that
>
how. What do you have to trade for it?
DEC equipment?
http://www.ricomputermuseum.org/Home/equipment/sequent-5000
--
Michael Thompson
des the instruction
6xxx, USER MODE H, and I/O TIME (1) and drives I/O PAUSE low.
--
Michael Thompson
PM, Michael Thompson <
michael.99.thomp...@gmail.com> wrote:
> The RICM has an opportunity to get a PDP-8/M (built in Maynard, MA) that
> is in Canada. I remember that there was a discussion on the procedure here,
> but I can't find it with Google.
>
> Can you either poin
The RICM has an opportunity to get a PDP-8/M (built in Maynard, MA) that is
in Canada. I remember that there was a discussion on the procedure here,
but I can't find it with Google.
Can you either point me to the discussion, or tell me what the procedure is?
--
Michael Thompson
ove to hear one of
> those running again. Do any still exist?
>
> Regards
>
> Rob
>
A while ago the Living Computers: Museum + Labs borrowed my LP20 controller
so they could clone the boards for one of their PDP-10s. Since they went
through that effort they must have a big line printer.
--
Michael Thompson
I am trying to LTSpice simulate a DEC H-724 power supply from a PDP-12. It
includes a Motorola SDA7 dual transistor. I can find any information on
this part. Anyone have any info?
--
Michael Thompson
1/2" tape drive and a fixed disk drive.
In the next week or so I will add them to the RICM WWW page.
--
Michael Thompson
have both above, I recommend a digital scope.
>
> Dwight
>
>
> --
> *From:* cctech on behalf of Michael
> Thompson via cctech
> *Sent:* Saturday, April 29, 2017 4:15:33 PM
> *To:* allison
> *Cc:* General Discussion: On-Topic Posts
> *Subject:* Re: Oscil
u choose,
> see if they will cut you a good deal for being a educational or non-profit.
> A lot of companies will, especially on a discontinued model.
>
> On Sat, Apr 29, 2017 at 6:15 PM, Michael Thompson via cctech <
> cct...@classiccmp.org> wrote:
>
>> Thanks
Thanks for the recommendation
Sent from my iPhone
> On Apr 29, 2017, at 4:30 PM, allison wrote:
>
>> On 04/29/2017 01:28 PM, Michael Thompson via cctech wrote:
>> The RICM just received $1,000 to buy a new oscilloscope. I would like a
>> four channel. and color
The RICM just received $1,000 to buy a new oscilloscope. I would like a
four channel. and color would also be nice. The bandwidth doesn't need to
be high because we usually work on ancient equipment.
What would you suggest?
--
Michael Thompson
demagnetized
> heads.)
>
> Thanks.
>
> JRJ
>
We used the procedure in the TU56 maintenance manual, and used two G888
modules to make the equivalent of the G500 described in the manual. The
G888 modules really cleanup the high frequency noise mixed with the head
signals.
--
Michael Thompson
Drawings both have the same revision sheet
TC12-0-LTR and the same error. Maybe all PDP-12s have this wiring error?
--
Michael Thompson
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